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Welcome to the System z Management Blog, where you can read the perspectives from System z experts. This Blog provides insights into the System z solution, as well as technical details about specific IBM products.

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Hello Community, this entry describes a performance enhancement involving the current plan VSAM dataset LSR buffering to be used in case of big workloads. Apar PM12394 that implements the enhancement, is available all TWS for z/OS releases (8.3.0 and later). The use of parameters CPBPLIM and CPDTLIM in controller OPCOPTS can cause performance issues when storage fragmentation occurs due to big plans execution. CPBPLIM allows to choose which percentage of the available storage can be used to allocate the buffers, CPDTLIM allows to choose... [More]

Recently OMEGAMON XE for CICS on z/OS support had a customer, who was having performance degradation problems with VSAM CA/CI split data and inquired about what interfaces are available to display this information. Briefly, OMEGAMON XE for CICS on z/OS provides the following interfaces to monitor and interpret VSAM statistics for CA/CI splits: 3270 OMEGAMON (menu system) OMEGAMON II (CUA) OMEGAMON XE for CICS on z/OS (TEP) The 3270 OMEGAMON (menu system) VSAM command provides VSAM statistics for CA/CI splits (similar to the LISTC TSO... [More]